Idler gear shims for the Pre A Plus gearboxes with 0.750" (19mm) size shafts.
Quantity required per gearbox is 2 but idler gear shims require shimming for correct clearance 3-6 thou as per workshop manuals but 3 thou for road and 4 thou for race is found to be reliable, see following
22A1545 130-131"
22A1546 132-133"
22A1547 134-135"
22A1548 136-137"
22A1549 138-139"